Mesen v0.5.2 Changelog:
This release is a beta - save states, movies, etc. created with this version may not be compatible with future versions of Mesen.
New Features
Compatibility: Added support for 6 new mappers (83, 126, 199, 215, 217, 220)
UNIF: Added support for CoolBoy boards.
Video: Added a few options in the advanced tab.
Bug Fixes
Accuracy: Improved IRQ timing for FDS emulation - fixes "Druid - Kyoufu no Tobira".
Accuracy: Fixed issues with mapper 245 games.
Debugger: Various bugfixes.